The biggest meat-eater at a massive 16m in length and weighed 8 tonnes. It lived 100m ya in the Cretaceous period. It preyed the heaviest dinosaur, Argentinosaurus, inArgentina.T-rex was the former holder of the record biggest killler at weighing 7 tons and being 14m in length. Giganotosaurus was bigger than T-rex. Giganotosaurus is king of the dinosaurs